<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>何为数据代理</title>
</head>
<body>
    <!-- 数据代理：通过一个对象代理另一个对象中属性的操作（读/写） -->
    <script>
        let o1={x:1}
        let o2={y:2}

        Object.defineProperty(o2, "x", {
            get(){
                return o1.x;
            },
            set(value){
                o1.x = value
            }
        })
        console.log(o2);
    </script>
</body>
</html>